Thomas goodenough



(No Model.)

T. GOODENOUGH. PNEUMATIO DOOR CHECK.

Patented Aug. 27, 1889.

UNITED STATES PATENT OFFICE.

THOMAS GOODENOUGI-I, OF WVOODSIDE, ASSIGNOR TO THE AKBAR MANU- FACTURINGCOMPANY, OF NElV YORK, N. Y.

PNEUMATIC DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 409,961, dated August27, 1889.

Application filed November 2, 1888. Serial No. 289,853- (No model.)

To aZZ whom. it may concern: the door. The main portion of theoperating- Be it known that I, THOMAS GOODENOUGH, rod D extendslongitudinally adjacent to the of WVoodside, in Queens county and Stateof bed-plate, and bears preferably on anti-fric- New York, have inventeda certain new and tion rollers d, journaled in the bed-plate near usefulImprovement in Door-Checks, of which its ends. The free end cl of therod D on its 5 5 the following is a specification. outer edge has avarying projection, (shown The invention relates more particularly to inthis example as curved substantially in thatclassknown as pneumaticdoor-checks, ogee form,) and this edge is provided with and it consistsin the construction and novel teeth 6, meshing with the teeth of theseg- IO combination of parts, as herein set forth, and mental gear E,which is adj ustably secured 6o pointed out in the appended claims. on ashaft E by means of a set-screw e, pass- In the accompanying drawings,Figure 1 is ing through a threaded opening f in a plain a front view ofa door-check as applied to a portion of the segmental gear into theshaft door and embodying my improvement. Fig. E, which hasjournal-bearings in arms f out- I 5 2 is a top plan view of the same,showing the standing and preferablyintegral with the bed- 65 door asopen; and Fig. 3 is a detail,in section, plate. The segmental gear isthus free to osillustrating the check-valve. cillate by the opening andclosing of the door. Similar letters of reference designate corre- Thetoothed edge of the segmental gear is ec sponding parts throughout thedrawings. centric to its shaft, conforming to the ogee of Referring byletter to the drawings, A desthe toothed portion of the operating-bar D,so 70 ignates a door, and A is its frame or casing, that when thegreater circumference of the to which is attached in any suitablemanner, gear E comes Within the concaved or lesser but preferably byscrews, the metal bed-plate portion of the toothed portion of the bar DB, which is arranged longitudinally above the the door, when nearlyclosed, has its speed door. The door-check proper comprises a somewhatchecked, allowing it to close quietly. 7 5 cylinder B, which isremovablysecured to the An arm F is rigidly secured to a downbed-plateby means of screws passing through wardly-extended journal of the shaftE, and openings in the lugs a a, extending from and this armlongitudinally of its greater length is integral with the heads b b ofthe cylinder. provided with a guideway or slot g, within 0 The openingsthrough the lugs a have an which projects a stud g 011 the bracket F, 80elongated form and open outward, so that the which is secured to theface of the door near securing-screws therefor need not be entirely itstop edge. removed from the bed-plate when itis desired H designates ahollow plug forming a seat to remove the cylinder, and also to allow afor the valve H, which has its shank portion 3 5 short longitudinaladjustment of the same. movable in the reduced hollow g of the plug 85Within the cylinder is the piston 0, having and is provided with aconvex head h at its its piston-rod O projected outward through a outerend. The hollow plug is preferably central opening in the head 1). Nearits outer screw-threaded, as at h, to engage a tapped end the piston-rodhas a reduced portion 0, opening through the head Z) of the cylinder,

designed to engage in the outwardly turned and a transverse pin or stop'6 is arranged 9o bifurcated end 0 of the operating-rod D. By within theenlarged hollow of the plug to prethis con struction of theoperating-rod and pisvent the valve from opening too far inwardly.ton-rod they are easily separated; but they An adjustable tappet-arm I,which, as herein may be otherwise or permanently secured toshown, isprovided with a threaded shank to gether without departing from thespirit of engage one of the series of tapped openings i 5 my invention.A spring D is coiled about in a projection I of the segmental gear E, isthe piston-rod within the cylinder and bears designed, when the door isnearly closed, to against the piston and the inner face of the strikeagainst the head h of the valve, thus head Z), and is designed to returnthe, piston forcing the valve inwardly, allowing the comto its normalposition, thus operating to close pressed air to escape from thecylinder around I00 the shank of the valve,which fits loosely within thereduced hollow of the plug. This adjustable tappet-arm, it is to beunderstood, need not be con fined to the particular combination ofelements herein set forth, but it may be applied to operate the valve inother pneumatic door-checks.

It is obvious that as the compressed air escapes the door will beentirely closed without jar by the force of the spring bearing upon thepiston.

Having thus described myinvention, what I claim is 1. In a door-check,the combination, with the cylinder, the spring-actuated piston, and thepiston-rod, of the operating-bar engaging the piston-rod and having acurved toothed portion of varying projection and a toothed eccentricgear engaging with said toothed portion operated by the door,substantially as specified.

2. The combination, with the cylinder, the spring-actuated pistontherein, and the pistonrod, of the operating-rod having the ogeeshapedtoothed portion, the anti-friction rollers bearing upon theoperating-ro(l, and the adjustable eccentric gear oscillated by aconnection with the door, substantially as specified.

3. The combination, with the cylinder, the piston, the piston-rod, thetoothed operatingbar, and the segmental gear, of the valve and thetappet-arm, removably secured to the cocentric segmental gear, operatedby means of a connection with the door, substantially as specified.

4. The combination, with the cylinder, the piston, the piston-rod, thetoothed operatingbar, and the segmental gear engaging therewith, of thevalve in the cylinder-head and the adjustable tappet-arm on thesegmental gear oscillated by a connection with a door, substantially asspecified.

Signed at New York, in the county of New York and State of New York,this 17th day of October, A. D. 1888.

THOMAS GOODENOUGI-I.

\Vitnesses:

(LR. FERGUSON, FRED KEMPER.

